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here is a sketch to go with the calcshttp://files.engineering.com/getfile.aspx?folder=7718f706-0732-4192-848b-59b9c37bf739&file=Visio-Drawing1.pdf

Guys, Here is the calculations that i have done, please take a look and let me know if i have done this correctly. http://files.engineering.com/getfile.aspx?folder=028c5e1c-57dc-46cf-b47d-c4ce129a083d&file=Gas_2011_07_05.xls

Sorry, the flow is 135000 lbs/hr and MW is 27.5

Inlet pressure of gas is 95 psig and temperature is 1150 F. The pipe is made up of a combination of 8" and 10" pipe. The pipe starts as 8" turns into 10" and then ties into a 36" stack. Here are some details of the piping Length and Fittings of 8" Pipe Length - 55 ft 90 deg bends - 3...

Thanks. I am sorry, it was going to be installed on the normal vent.

on the tank

The solvent is a mixture of ethanol, methanol and propyl acetate. So the classification is IB.

I am using the sudden expansion formula from the attached website and it is only giving me a 70% reduction in pressure due to the sudden expansion. So, at base of the stack I am getting 4.5 psig. However, if i work back from the top of the stack it does not converge. The pressure drop...

Would a solvent storage tank require a flame arrestor if it already has a pressure relief valve or emergency vent?

The 15 psig was calculated right before the gas entered the stack. Can PV=nRT be used to calculate the pressure in the stack after it has been expanded? Also, can the transition from the pipe to the stack be treated as a sudden expansion from 10" to 36" or can it be assumed that the pressure...

If a gas passing through a 10" pipe has a pressure of 15 psig enters a stack that is 36" in diameter. The stack is 80 ft long and is open to the atmosphere. Would the gas as it enters the stack still have a pressure? or would the pressure at the base of the stack be atmospheric.